Analysis of information sources in references of the Wikipedia article "Ήλιο" in Greek language version.
At the origin of the helium leak detection method was the Manhattan Project and the unprecedented leak-tightness requirements needed by the uranium enrichment plants. The required sensitivity needed for the leak checking led to the choice of a mass spectrometer designed by Dr. A.O.C. Nier tuned on the helium mass.[νεκρός σύνδεσμος]